There are 2 passwords - one for the settings and one for wifi devices - have you tried thm both? If no luck try on an ethernet cable connected device if you were using wifi - or vica versa. Also try different browsers.
ays do a "60-second hold" pinhole reset to put them back to that.
For iPhone security, see
https://community.virginmedia.com/t5/Networking-and-WiFi/iOS-14-Weak-Security/td-p/4410050
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.